sparebank1_actual_budget_integration/src/sparebank1.ts

import {
  SPAREBANK1_OAUTH_CLIENT_ID,
  SPAREBANK1_OAUTH_REDIRECT_URI,
  SPAREBANK1_OAUTH_STATE,
} from "../config.ts"

// TODO move types
export interface OAuthTokenResponse {
  access_token: string
  expires_in: number
  refresh_token_expires_in: number
  refresh_token_absolute_expires_in: number
  token_type: "Bearer"
  refresh_token: string
}

export interface Transaction {
  id: string
  date: string
  amount: number
  description: string
  cleanedDescription: string
  remoteAccountName: string

  [key: string]: string | number | boolean | unknown
}

export type Bank = Sparebank1

export interface Sparebank1 {
  accessToken: () => Promise<OAuthTokenResponse>
  refreshToken: (refreshToken: string) => Promise<OAuthTokenResponse>

  transactionsPastDay: (
    accountKeys: ReadonlyArray<string> | string,
    accessToken: string,
  ) => Promise<ReadonlyArray<Transaction>>
}

export class Sparebank1Impl implements Sparebank1 {
  private baseUrl = "https://api.sparebank1.no"

  async accessToken(): Promise<OAuthTokenResponse> {
    const response = await fetch(`${this.baseUrl}/oauth/authorize?
client_id=${SPAREBANK1_OAUTH_CLIENT_ID}&
state=${SPAREBANK1_OAUTH_STATE}&
redirect_uri=${SPAREBANK1_OAUTH_REDIRECT_URI}&
finInst=fid-smn&
response_type=code`)

    if (response.ok) {
      return await response.json()
    }
    throw new Error(`Failed to get access token. ${response.statusText}`)
  }

  async refreshToken(refreshToken: string): Promise<OAuthTokenResponse> {
    throw new Error("Not implemented")
  }

  async transactionsPastDay(
    accountKeys: ReadonlyArray<string> | string,
    accessToken: string,
  ): Promise<ReadonlyArray<Transaction>> {
    throw new Error("Not implemented")
  }
}